Not after. 
I know my dentist has been recommending this for ages but have forgotton why. Couldn't imagine going out with porridge betweeen my teeth. 
And isn't it hard to get the kids to brush for two minutes. Ds's school used to like them to brush their teeth after lunch and my dentist was not happy about it so I was the only one who didn't send in a toothbrush and toothpaste.
Fillings in the under tens are increasing.